<!DOCTYPE html>
<html>
<head>
	<title>CSS3实现鼠标悬停显示消息提示框</title>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width" initial-scale="1">
	<link type="text/css" rel="stylesheet" href="css/style.css">
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</head>
<body>
	<div class="nav">
		<ul>
			<li><a href="#" class="tooltip tooltip-effect-1">Home<span class="tooltip-content"><i class="fa fa-home fa-fw"></i></span></a></li>
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			<li><a href="#" class="tooltip tooltip-effect-3">Photography<span class="tooltip-content"><i class="fa fa-camera-retro fa-fw"></i></span></a></li>
			<li><a href="#" class="tooltip tooltip-effect-4">Work<span class="tooltip-content"><i class="fa fa-briefcase fa-fw"></i></span></a></li>
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